Wildfires ravage Sierra Nevada mountains in California

Firefighters battling the King Fire watch as a backfire burns along Highway 50 in Fresh Pond, California September 16, 2014. REUTERS/Noah Berger

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Inmate firefighters battling the King Fire watch for flying embers while a backfire burns along Highway 50 in Fresh Pond, California September 16, 2014. The fire led officials to call on about 400 people to evacuate from areas threatened by the blaze, Cal Fire spokeswoman Alyssa Smith said. It has charred more than 11,500 acres (4,654 hectares) and was 5 percent contained on Tuesday. REUTERS/Noah Berger

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A DC-10 tanker drops fire retardant on the King Fire near Fresh Pond, California September 17, 2014. REUTERS/Noah Berger

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A helicopter draws water from a lake while battling the King Fire in Pollock Pines, California September 17, 2014. REUTERS/Noah Berger

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A firefighter watches the King Fire burn near Fresh Pond, California September 17, 2014. REUTERS/Noah Berger

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A DC-10 tanker drops fire retardant on the King Fire near Fresh Pond, California September 17, 2014. REUTERS/Noah Berger

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A helicopter draws water from a lake as smoke rises from the King Fire in Pollock Pines, California September 17, 2014. REUTERS/Noah Berger